18920464 has 20 divisors (see below), whose sum is σ = 36734380. Its totient is φ = 9440640.

The previous prime is 18920459. The next prime is 18920477. The reversal of 18920464 is 46402981.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 2274064 = 4080^2 + 1508^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9682 + ... + 11470.

It is an arithmetic number, because the mean of its divisors is an integer number (1836719).

Almost surely, 2^18920464 is an apocalyptic number.

It is an amenable number.

18920464 is a deficient number, since it is larger than the sum of its proper divisors (17813916).

18920464 is a wasteful number, since it uses less digits than its factorization.

18920464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 18920464 is about 4349.7659707161. The cubic root of 18920464 is about 266.4673037691.

The spelling of 18920464 in words is "eighteen million, nine hundred twenty thousand, four hundred sixty-four".